Geodesic
A variational approach to the problem of free damped longitudinal oscillations of a prismatic beam with a nonlinear elastic characteristic
Theoretical and applied mechanics, Tome 3 (1977) no. 1, p. 53 Cet article a éte moissonné depuis la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

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Finding the law of oscillation of a prismatic rod during free damped longitudinal oscillations with a non-linear elastic characteristic is considered. \[ igma=E(1-a_3E^2e^2_x)e_x. \] In doing so, it is assumed that the nonlinearity is weak and that damping is achieved by viscous friction forces that are proportional to the first degree of speed. The task was solved in two ways, using Hamilton's and Vujanović's variational principles with non-commutative variations. Using both methods, the same results were obtained. The simplicity, efficiency and broad possibility of applying the variational principle with non-commutative variations are pointed out. 
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     author = {{\DJ}ula Me\v{s}ter},
     title = {A variational approach to the problem of free damped longitudinal oscillations of a prismatic beam with a nonlinear elastic characteristic},
     journal = {Theoretical and applied mechanics},
     pages = {53 },
     year = {1977},
     volume = {3},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAM_1977_3_1_a7/}
}
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Đula Mešter. A variational approach to the problem of free damped longitudinal oscillations of a prismatic beam with a nonlinear elastic characteristic. Theoretical and applied mechanics, Tome 3 (1977) no. 1, p. 53 . http://geodesic.mathdoc.fr/item/TAM_1977_3_1_a7/